Does 3 Tesla Magnetic Resonance Imaging Have Adverse Effect on Cochlear Functions?

Area of Science:

• Audiology
• Medical Imaging
• Otoacoustic Emissions

Background:

• Magnetic Resonance Imaging (MRI) utilizes strong magnetic fields and acoustic noise.
• The potential impact of 3 Tesla (3T) MRI noise on cochlear function requires investigation.
• Distortion Product Otoacoustic Emissions (DPOAEs) are a sensitive measure of cochlear outer hair cell function.

Purpose of the Study:

• To evaluate the effects of 3T MRI noise on cochlear functions using DPOAEs.
• To determine if 3T MRI causes any permanent or significant adverse effects on hearing.

Main Methods:

• 17 patients (33 ears) underwent DPOAE testing before and after 3T MRI.
• DPOAE amplitudes were measured at multiple frequencies (1-8 kHz).
• Post-MRI measurements were taken immediately after and 30 minutes following the scan.

Main Results:

• Significant differences in DPOAE amplitudes were observed at 3, 6, and 8 kHz post-MRI.
• Immediately after MRI, DPOAE amplitudes were lower at 3, 6, and 8 kHz compared to pre-MRI.
• A significant reduction in DPOAE amplitude at 8 kHz persisted 30 minutes post-MRI.

Conclusions:

• 3T MRI noise induces temporary, high-frequency DPOAE amplitude changes.
• These observed changes are considered clinically negligible.
• 3T MRI with protective headphones is considered safe for hearing function.